3道数学题,请各位帮忙,按初一的答,要详细过程!

题目

3道数学题,请各位帮忙,按初一的答,要详细过程!
{2x+y=2~y=4x-1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~{2x+3y=-9~3x-2y=19~~~~~~~~~~{x-3/2(2x-1）≤4~1+3x/2>2x-1

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